Whaller - Create your own free and unlimited private social networks.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
hub - The Hub is a versatile intranet portal and collaboration solution that boosts employee engagement and productivity in a digital workplace.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Hallo App - A private social network for your friends
Slack - A messaging app for teams who see through the Earth!